1995 Chevy G20 stalls.

It will idle, but as soon as I put it in gear it dies. I have changed plugs, throttle position sensor, O2 sensor, checked for leaks, checked timing, rplaced fuel filter, but nothing seems to work. Need my van for work. Need a solution quick.

Not sure if this will help. I have seen this happen!!! remove the cover under the steering column and locate the ignition switch. Get a flash light. You really need a flash light to see this. Set the E-Brake real good. While watching the ignition switch. (actual SWITCH not where the Key goes) . Turn the key back and forth with out starting and see if the switch is loose. (it has 2 hex head screws in it ) and is like 4 inches long with a bunch of wires in it and mounted the passenger side of the column under dash. If you cant see it move then try removing it from park and see if it moves. The switch is mounted on slotted holes. and if it is loose it will only move with the legnth of the column or front to back of vehicle. any ways if it is loose there is a way to put it back right ... as fallows: key needs to be in the off position. loosen screws 1/2 turn each, use your finger to push the switch up towards the key but not force it. like pushing a key on a key board. Tighten both screws and check it out. This seems like a long process to go through but it costs nothing but time.

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throttle position sensor can cause the high idle as will a hole in the egr valve tube as far as stalling as soon as u put in to gear could be torque converter not unlocking but id check the egr tube first

may be egr valve is what dont work. i replaced my with wrong one and it did do same like what problem you have and i get right one its work fine. i cant remember if car is eguipped with gas exhaust vent in passenger side exhaust pipe but check that also if its in there and vent is working proberly.it would open when engine is warn.